Cone crusher



Feb. 24, 1970 w. MAY 3,497,146

CONE CRUSHER Filed Sept. 15. 1967 2 Sheets-Sheet l BY Hal ATTORNEYS Feb. 24, 1970 w. MAY 3,497,146

CONE CRUSHER Filed Sept. 15. 1967 2 Sheets-Sheet 2 INVENTOR mu elm m 0.5

BY P

ATTORNEYS United States Patent 3,497,146 CONE CRUSHER Wilhelm May, Rheinhausen, Germany, assignor, by mesne assignments, to Nordberg Manufacturing Company, Milwaukee, Wis.

Filed Sept. 15, 1967, Ser. No. 668,062 Claims priority, application Germany, Sept. 15, 1966, B 88,916 Int. Cl. B02c 2/04 US. Cl. 241293 4 Claims ABSTRACT OF THE DISCLOSURE In a cone crusher having two members rotatable relative to one another about a substantially vertical axis and each presenting an essentially conical surface, the lower conical surface being provided with depressions disposed in the lower portion of the crushing zone between the two conical surfaces so as to cause the material being crushed to accumulate in this lower portion and hence to be subjected to a more thorough crushing.

Background of the invention The present invention relates to crushers, and particularly to cone crushers of the type having two relatively rotatable conical surfaces defining between them a crushing zone of progressively decreasing cross-sectional area.

In cone crushers the material being treated is known to undergo size reduction in a hollow space formed between an open-bottom hollow cone having a perpendicular axis and an eccentrically pivoted solid cone arranged underneath. Both cones are provided with liners of particularly wear-resistant material, i.e. a bowl liner and a mantle which form the upper and lower boundaries of what is known as the crushing zone.

In cone crushers of hitherto known design, the mantle forms a rotary body with a generatrix which is either a straight line or composed of several straight-line segments. When the mantle is so designed, the material undergoing size reduction in the lower portion of the crushing zone is to a large extent dispersed and the crushed particles cannot exert suflicient further crushing action on each other. v

The discharged product frequently does not contain a large portion of small particles and the particles do not have the desired somewhat cubical shape as required today, particularly in road construction.

Summary of the invention It is a primary object of the present invention to overcome these drawbacks and difliculties.

Another object of the present invention is to substan' tially improve the crushing action of such crushers.

Still another object of the present invention is to impede the dispersal of crushed particles in the lower portion of the crushing zone.

Yet another object of the present invention is to bring about an accumulation of the material being crushed in the lower portion of the crushing zone and thus to attain a more repeated comminution.

These and other objects according to the invention are achieved by providing the mantle with depressions, particularly in the lower portion of the crushing zone. It appears particularly advisable to give these depressions 3,497,146 Patented Feb. 24-, 1970 the form of grooves arranged on several circles lying symmetrically to the main axis of the mantle. The grooves can either be continuous and thus encircle the mantle without any interruption or they can be arranged on angularly offset arcs of one circle or of several adjacent circles.

Brief description of the drawings Description of the preferred embodiments FIGURE 1 shows the parts of a cone crusher which form the crushing zone and which include a head 1 with main shaft 2 which, when rotating, undergoes an eccentric movement. The head 1 carries a mantle 3 which is a replaceable wear-resistant element. Opposite to the latter, a bowl liner 4 is attached to a bowl 5. In the crushing zone located between elements 3 and 4, the material to be crushed, entering from above and discharged laterally, is reduced in size by the eccentric throw of the main shaft 2 carrying head 1 and mantle 3.

The mantle 3 is provided, according to the invention, with depressions in the form of grooves 7 which, in the example shown in FIGURE 3, encircle the mantle in the form of two uninterrupted circles 7 each concentric with the main shaft 2 and, in FIGURE 4, are shown as spaced, angularly offset arcs 7" of two such circles. The depressions, instead of having the shape of grooves, can be given any other desired shape such as circular, oval, polygonal, or other recess shapes. Tests have shown that they all cause the material being crushed to accumulate and consequently to be subjected to the size reducing crushing action more repeatedly, i.e. during a greater number of revolutions of shaft 2, than in designs hitherto used. The product thus contains a larger proportion of fine particles and a more favorable cubical particle shape.

The power train, the eccentric carrying the main shaft and causing its eccentric movement, etc., are of conventional design and therefore are not shown in the drawings.

It will be understood that the above description of the present invention is susceptible to various modifications. changes, and adaptations, and that the same are intended to be comprehended within the meaning and range of equivalents of the appended claims.

I claim:

1. A mantle for a cone crusher, said mantle having the shape of a truncated cone with a planar upper surface,

at least one groove formed in said surface adjacent the lower portion thereof with said groove being defined by sidewalls of generally equal height and having a width generally equal to the height of the sidewalls.

2. The structure of claim 1 further characterized in that at least one of said grooves lies on a circle arranged concentrically with the axis of the mantle.

3. The structure of claim 2 further characterized in that a plurality of grooves are formed in said planar upper surface and each groove extends for a distance less than that of a complete circle with the grooves on one circle being offset angularly relative to the grooves in the other circles.

4. The structure of claim 3 further characterized in 5 4; References Cited UNITED STATES PATENTS 4/1953 Zoerb 24l293 X 9/1955 Burls 241-299 X FRANK T. YOST, Primary Examiner 

